Motion-picture-film strip



' A. F. SU LZER MOTON PICTURE FILM STRIPv Filed Aug. 23. 1926 Fl E- suc/7 as loyrw/Q Albe FSUQQJ;

I N VEN TOR.

` ATTORNEYS.

Patented Oct. 9, 1928.

UNITED STATES 48P,ATnaarA OFFICE.

.ALBRT F. SULZER, OF ROCHESTER, NEW YORK, ASSIGNOB TO ,KODAK` 00H? PANY, 0F ROCHESTER, NYOBK, .L CORPORATION OF NEW YORK.

' IOTION-PIOTUREFIII STRIP'.

Application led August 23, 1926.: Serial No. 130,812,

This invention relates to motion icture film -and more particularly to such lm as is furnished in al cartridge for daylight loading in a portable camera.

As thus furnished, a typical cartridge comprises a reel having wound thereon a film strip. comprising a sensitized film band with protective paper bands attached to the ends thereof. ,Thisfmay be used -in cameras of various. types,A typical examples being shown in the patents to Tessier, 1,572,252, granted Feb. 9, 1926A; andWittel, 1,588,082, granted June 8,1926. 4

lIn such apparatus, -the film strip is fed in self-supported loops from a 'feeding means, suchas a sprocket," to a gate and fromthe gate to a eedin means. The sensitized film band, being o a plastic cellulosic material such as a composition of cellulose acetate, :cellulose nitrate, cellulose ether, viscose, or the like, (preferably acetate) is suffi# ciently stiff and elastic to maintain such .loops without diiiculty. The paper protective bands, however,` have muchless body and there is sometimes a tendency for them to buckle as they are being fed through the mechanism. This is particularly liable to be the case where the cartridge has been subected to humid atmospheric conditions ten ing` to make the paper especially limp. Under such' condltions, moreover, the protection afforded the sensitiveviilm band by i the paper against atmospheric influences is lessened.

The objects of my invention are, therefore, to increase the stiffness and elasticity of the protective bands, 'to render such bands waterproof, and thus to increase the protection afforded the sensitized film, and to render them readily attachable to the vfilm. These and other objects. are attained by applying to one or both surfaces, of the paper v leader band, a layer or ycoatin of cellulosic varnish, or like stiiening an waterproofing material. There'may be furtherappliedto one surface of the leader band a coat-- which the band is-the.

ing of gelatine, by

more readily applied'to the sensitizedvilm,

and this layer may include wax.

Reference will now be made to the accom? panying drawing wherein the same reference -an unexposed sensitized film -face of which is a' light sensitive characters denote the same parts throughou.

Fig. 1 is a" perspective view of a reel of tilm embodyin vmy invention, one flange bemg partly bro enaway: p

Fig; 2 1s a perpective view on an enlarged scale of a portion of the film strip, includlng the junction of the sensitized portion and a lead\band: l Figs. 3, 4 and 5 are edge views of similar fragments showing modied forms ofemy invention.

In Figs. 2, 3, 4 and 5 the thicknesses are,

-for the sake of clearness, much'exaggerated.-

The film cartridge, as furnished for cameraA use, comprises a reel having side flanges 1, and a core 2, upon which is wound a pro# tective portion 3, coiled directly on the core, portion 4 attached at one end to the outer end of the rotective portion 3 and an outer leader and or protective portion 5 attached at one end to the outer end of the coiled sensitized portion 4 and wound around it, the protective portions and 5 thus forming continuatlons of the sensitized portion 4 and the three portions 3, 4 and 5 constituting in effect a single, coiled 4usual perforations 1'1.

The sensitized portion consists, as is usual,

of a support 'made from a plastic cellulosic material, asmentioned above, upon one surhotographic layer v7 such for instance, as o gelatino-silver-halide emulsion.

-The leader band 5 consists of al paper band 8 which has been drawn-through a suitable varnish .wh'erebythe paper 1s coated upon both surfaces with a tlun layer 9 of such varnish. The varnish will, to a certain extent, penetrate Iand impregnate the paper, making a thoroughly water roof material. The varnish layers also ad materially to the normal ,stiffness of the paper and thus 9 tend, not only to prevent the paper from becoming limpl due to the effect of moisture, butto increase its natural stiffness and elas' ticity. Of course, the varnish can be applied to the paper by any other` desired coat- 100 ing or impregnating rocess.

Such a protective and is preferably ap-v hn strip having the plied to the gelatine side of the lilm ortion cation. The amount o temperature employed.

appliedto the support side as indicated in Fig. 4, b the use of any common solvent or known cement such as a mixture of equa-l volumes of acetone, methyl alcohol, butyl acetate, and methyl acetate.

I prefer, however, in order to obtain the most dependable splice between the portions, to coat upon one of the varnished surfaces 9 of theprotective portion a layer or sizing of gelatine 10, and then to glue, paste or cement this gelatine layer 10, to the gelagno-halide layer 7, this l(being shown in n the'form shown in Fig. `l5, the paper band 8 has a cellulosic varnish layer 9, on one' surface only, and on the other surface a gelatine layer 10, which is adherent to the sensitized ge atine la er 7.

As shown particu arly in Figs. 2 Vand 3, the varnish layers 9 are much thinner than the paper 10, but as noted above these parts are shown as exaggerated in thickness and are not drawn to scale.

'If desired, the elatine coating 10 may have incorporated ierein or applied thereto any suitable wax to prevent its being deleteriously affected by moisture, and also rendering it more easily slidable through the apparatus. y y

ne wa of doing this is by adding the wax to a cated 10% gelatine size solution, and adding enough ses?) to produce emulsiiwax used is live percent by weight of the gelatine solution, land lthe amount of soap necessary is from onehalf to two percent. The wax used would be one having a-melting pointl below the An suitable organlc or inorganic wax, suc as paraiine wax or beeswax may be used. In general, the temperature reached and the time for which the solution is maintained at that temperature, are such that the particular gelatine used will not be harmfully broken down ordeleteriously affected. The roportilons given are, of course, by wayy lo examvv e. 4 p This mixture ,is preliminarily stirred and then homogenized to a colloidal state in any suitable apparatus or mill. It may be .applied byany suitable coating method, as by rushes or rolls. After the coating Vhas hardened, it is calendered.

The varnish or cellulosic layer or layers are preferably applied to the paper when the latter is in the form of a long band kof considerable width, and this is then slit-ted and cut to the sizes desired.

Any of the well knownjarnishes having the properties specified may be used, such as those embodying a cellulosic ester or ether,-

remporta.v

ypical ones that are satisfactory being the following: l 1

Partsby v weight I, Cellulose nitrate 100 Fusel oil or butyl -alcohol Methyl alcohol 900-2000 Camphor 10-30 or II, Cellulose 'acetate 100 Diethyl phthalate 10-50 ity, such for instance as is used in easy iowing lacquers and lacquers intended to be applied by spraying, though I do not limit myself thereto.

The specific forms herein disclosed are by way of example. It is obvious that nur.

merous embodiments are possible, and I contemplate as within my invention all such modiiications and equivalents as fall within the scope of the ap ended claims.

-I-Iaving thus escribed my invention,

what I claim as new and desire .to secure by Letters Patent is:

1.-A motion picture film strip including a band of sensitized film `with an unsensitized protective band at each end thereon, one end of each protective band being secured to one end of the `ilm band, and each protective band comprising a strip'of paper and a layer of stiil'ening and waterproong vcellulosic composition.

2. `A motion icture film strip including a band of sensitized film comprising a support of flexible cellulosic material with a sensitized, gelatinous layer thereon and a leader band comprising a strip of pa er,

the leaderband carrying a layer of sti en- .ingA and waterproofing varnish upon one surface and carrying vupon the other a'layer of gelatine, one end of the .leader band hav-A ing its gelatine surface adherentlyiattached to the vgelatinous layer at lone end of the hlm band.

3. As an article of manufacture, a strip of coiled 'material adapted for use in a motion picture apparatus and including a coiled sensitized film band comprising a cellulosic support having on one surface a sensitized, gelatinous layer, and .a leader .bandatt-ached at one ,end to the outer end ofPthe lcoiled film and coiled around said `film, said 'leader band including a strip of paper and a layer of stiiening `and' waterproofing cellulosic material and having on coiled sensitized film band comprising a cellulosic film support having on 'one'surface a sensitized, gelatinous layer, and a leader band attached at one end to the outer end of the `coiled film and coiled around said film, said leader band comprising a strip of paper having on each surface a layer of cellulosic varnish and having additionally onone surface a layerof unsensitized gelatine, the two bands having their gelatine layers adherently attached together.

5. A motion picture film strip including a band of sensitized material and a protective band forming a continuation thereof and having on one surface a deposit embodying wax.

6. A motion picture film strip including a band of sensitized material and a protective band forming a continuation thereof and comprising a strip vof paper and having upon one surface a layer of waterproof cellulosic composition and upon the other surface a layer embodying wax.

7. A motion picture'filrn strip including a band of sensitized material and a protective band forming a continuation thereof and comprising a strip of paper and having upon one surface a layer of waterproof day of August, 1926.

cellulosic composition and upon the other surface a layer embodying gelatine and waX.

8. As an 'article of manufacture, a strip of coiled material adapted for use in a motion picture camera and including a coiled sensitized film band comprising a cellulosic surface having upon one surface a sens1t1zed,

gelatinous layer, and a leader band attached at one end to the outer end ofv the coiled film and coiled around said film, said leader band including a strip of paper and a layer of waterproof cellulosic material and having on one surface a layer including gelatine and wax, the two bands having their gelatine layers adherently attached together.

9. As an article of manufacture, a strip of coiled material adapted for use in a motion picture camera and including a coiled film band comprising a cellulosic vfilm support having on one surface an unexposed sensitized, gelatinous layer, and a leader band attached at one end to the outer end of the coiled film band and coiled around said film band, said leader band comprising a strip of paper having on each surface a laver of stifl'ening and waterproofing cellulosic varnish, and having additionally on one surface an unsensitized layer including gelatine and wax, Athe twobands having their gelatinous layers adherently attached together. Q

Signed at Rochester, New York, this 18th ALBERT F. SULZER.. 

